Powerstock is a village and civil parish in south west Dorset, England, situated in a steep valley on the edge of the Dorset Downs, 5 miles (8.0 km) north-east of the market town of Bridport. The civil parish includes the village of West Milton to the west and the summit and northern slopes of Eggardon Hill to the south-east. Powerstock village contains many cottages and 2 inns: The Three Horseshoes near the church and The Marquis of Lorne Inn on the other side of the valley in a small hamlet called Nettlecombe. The small Mangerton River runs through the valley. In 2012 the parish had an estimated population of 320.[1] In the 2011 census figures have been published for Powerstock parish combined with the small parish of North Poorton to the north; the population in this area was 358.[2]

The origins of the name Powerstock have not been fully determined; the second part derives from the Old Englishstoc, meaning an outlying farmstead, but the first part—similar to the nearby settlement of Poorton—is unresolved.[3] In the Domesday Book of 1086 it was recorded as Povrestoch.[3] According to one source, the name was 'Poorstock' until the Bridport Railway was built through the village in 1857, when the change to Powerstock was made to avoid connotations of 'poor (rolling) stock'.[4] However another source states the name existed in its current form as early as 1787.[5]Powerstock railway station (and the entire Bridport branch line) closed on 5 May 1975.

The nearby Eggardon Hill (height 252 metres) lies about 1.5 miles south-east of the village. On the summit is a 14 hectare Iron Age hill fort, from which can be viewed a wide panorama of the west Dorset countryside. Just over a mile to the east of the village lies the nature reserve of Powerstock Common.